#!/usr/bin/env python
# -*- coding:utf-8 -*-
import sys

sys.path.append('..')
from common_utils import CBBCommonUtils

file_blacklist = ['/usr/bin/chage', '/usr/bin/gpasswd', '/usr/bin/wall', '/usr/bin/chfn', '/usr/bin/chsh', '/usr/bin/newgrp', '/usr/bin/write', '/usr/sbin/usernetctl', '/usr/sbin/traceroute', '/bin/mount', '/bin/umount', '/bin/ping', '/sbin/netreport']

def get_plugin_info():
    plugin_info = {
        "name": "centos_access_control_014 Check_permissions_on_important_files",
        "plugin_id": "centos_access_control_014",
        "plugin_type": "Access Control",
        "info": "Check for suid and sgid permissions on important files",
        "level": "C",
        "module": "Safety reinforcement",
        "author": "fanyi",
        "keyword": "Safety reinforcement",
        "configable": "false"
    }
    return plugin_info


logger = None
cur_user = None
cur_module = None
cur_task = None


def set_plugin_logger(setter, user, module, task, *args, **kwargs):
    global logger, cur_user, cur_module, cur_task
    logger = setter
    cur_user = user
    cur_module = module
    cur_task = task


# 扫描函数
def scan(ip, sys_user, sys_pwd, flag=0):
    des_list = []
    error_count = 0
    # 各文件权限情况记录及有无风险的标记
    d_flag = 0
    file_status = []
    logger.debug_info(cur_user, cur_module, cur_task+'_Scan', '', "Scan Start.")
    # 检查权限状态
    for i, value in enumerate(file_blacklist):
        cmd = "find " + value + " -type f -perm /6000 2>/dev/null"
        result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
        if not result and len(output) == 0:
            file_status.append("safe")
        elif not result and len(output) != 0:
            file_status.append("unsafe")
            d_flag = 1
            des_list.append(value)
            logger.debug_warning(cur_user, cur_module, cur_task+'_Scan', '', value)
            error_count = 1
        else:
            file_status.append("safe")
    if d_flag == 0:
        des_list.append("All Safe")
        logger.debug_info(cur_user, cur_module, cur_task+'_Scan', '', "All Safe.")
    des_list.append("Scan Complete.")
    logger.debug_info(cur_user, cur_module, cur_task+'_Scan', '', "Scan Complete.")
    # 是否加固
    if flag == 1 and d_flag == 1:
        reinforce_des, reinforce_err = reinforce(ip, sys_user, sys_pwd, file_status)
        if reinforce_err == 0:
            error_count = 0
            des_list.extend(reinforce_des)
        else:
            error_count += 1
            des_list.extend(reinforce_des)
    return des_list, error_count


# 加固函数
def reinforce(ip, sys_user, sys_pwd, file_status):
    des_list = []
    error_count = 0
    logger.debug_info(cur_user, cur_module, cur_task+'_Reinforce', '', "Reinforce Start.")
    # 检查是否存在可能被覆盖的备份文件
    check_cmd = "ls /etc | grep FileAccess.`date +%Y-%m-%d`"
    check_result, check_output = CBBCommonUtils.cbb_run_cmd(ip, check_cmd, username=sys_user, passwd=sys_pwd)
    if not check_result and len(check_output) == 0:
        for i, value in enumerate(file_status):
            if value != "safe":
                cmd = "find " + file_blacklist[i] + " -type f -perm /u=s 2>/dev/null"
                result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
                if not result and len(output) == 0:
                    value = "NUS#" + file_blacklist[i]
                elif not result and len(output) != 0:
                    value = "US#" + file_blacklist[i]
                else:
                    error_count += 1
                    backup_check_des = "Access Check Error."
                    des_list.append(backup_check_des)
                    logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
                    return des_list, error_count
                cmd = "find " + file_blacklist[i] + " -type f -perm /g=s 2>/dev/null"
                result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
                if not result and len(output) == 0:
                    value = "NGS#" + value
                elif not result and len(output) != 0:
                    value = "GS#" + value
                else:
                    error_count += 1
                    backup_check_des = "Access Check Error."
                    des_list.append(backup_check_des)
                    logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
                    return des_list, error_count
            cmd = "echo \"" + value + "\" >> /etc/FileAccess.`date +%Y-%m-%d`"
            result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
            if len(result) != 0:
                error_count += 1
                backup_check_des = "Write Backup file FAILED."
                des_list.append(backup_check_des)
                logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
                return des_list, error_count
    elif not check_result and len(check_output) != 0:
        logger.debug_info(cur_user, cur_module, cur_task+'_Reinforce', '', "Backup file Exist.")
    else:
        error_count += 1
        backup_check_des = "Backup file check FAILED."
        des_list.append(backup_check_des)
        logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
        return des_list, error_count
    # 检查是否备份成功
    check_cmd = "ls /etc | grep FileAccess.`date +%Y-%m-%d`"
    check_result, check_output = CBBCommonUtils.cbb_run_cmd(ip, check_cmd, username=sys_user, passwd=sys_pwd)
    if not check_result and len(check_output) != 0:
        logger.debug_info(cur_user, cur_module, cur_task+'_Reinforce', '', "Backup Succeed.")
    else:
        error_count += 1
        backup_check_des = "Backup check FAILED."
        des_list.append(backup_check_des)
        logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', backup_check_des)
        return des_list, error_count
    # 加固
    for i, value in enumerate(file_status):
        if value != "safe":
            safe_cmd = "chmod a-s " + file_blacklist[i]
            result, output = CBBCommonUtils.cbb_run_cmd(ip, safe_cmd, username=sys_user, passwd=sys_pwd)
            if len(result) != 0:
                error_count += 1
                des_list.append("Reinforce Error.")
                logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', "Reinforce Error.")
                # 加固失败，回滚
                rollback_des, rollback_err = rollback(ip, sys_user, sys_pwd)
                if rollback_err == 0:
                    des_list.extend(rollback_des)
                else:
                    error_count += 1
                    des_list.extend(rollback_des)
                return des_list, error_count
    # 初始化
    flag = 0
    file_status = []
    # 检查加固结果
    for i, value in enumerate(file_blacklist):
        cmd = "find " + value + " -type f -perm /6000 2>/dev/null"
        result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
        if not result and len(output) == 0:
            file_status.append("safe")
        elif not result and len(output) != 0:
            file_status.append("unsafe")
            flag = 1
        else:
            file_status.append("safe")
    # 记录和返回
    if flag == 0:
        des_list.append("Reinforce Complete.")
        logger.debug_info(cur_user, cur_module, cur_task+'_Reinforce', '', "Reinforce Complete.")
        return des_list, error_count
    else:
        error_count += 1
        des_list.append("Reinforce Failed.")
        logger.debug_error(cur_user, cur_module, cur_task+'_Reinforce', '', "Reinforce Failed.")
        # 加固失败，回滚
        rollback_des, rollback_err = rollback(ip, sys_user, sys_pwd)
        if rollback_err == 0:
            des_list.extend(rollback_des)
        else:
            error_count += 1
            des_list.extend(rollback_des)
        return des_list, error_count


# 回滚函数
def rollback(ip, sys_user, sys_pwd):
    des_list = []
    error_count = 0
    logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', "Rollback Start.")
    # 查找备份文件，此处的查找支持多备份文件的查找（结果会按时间顺序排序），并默认回滚最新一次备份的内容，可以连续多次回滚
    grep_cmd = "ls /etc/ | grep FileAccess..*"
    result, output = CBBCommonUtils.cbb_run_cmd(ip, grep_cmd, username=sys_user, passwd=sys_pwd)
    if not result and len(output) != 0:
        target = output[len(output) - 1].replace("\n", "")
    else:
        error_count = -1
        des_list.append("Backup file NOT FOUND.")
        logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', "Backup file not found.")
        return des_list, error_count
    # 回滚文件
    cmd = "cat /etc/" + target
    result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
    if not result:
        for i, value in enumerate(output):
            value = value.replace("\n", "")
            if value != "safe":
                rollback_value = value.split("#")
            else:
                rollback_value = [' ', ' ', ' ']
            if rollback_value[1] == "US":
                cmd = "chmod u+s " + rollback_value[2]
                result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
                if len(result) != 0:
                    error_count += 1
                    err_des = rollback_value[2] + " suid rollback failed"
                    des_list.append(err_des)
                    logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', err_des)
                    return des_list, error_count
            if rollback_value[0] == "GS":
                cmd = "chmod g+s " + rollback_value[2]
                result, output = CBBCommonUtils.cbb_run_cmd(ip, cmd, username=sys_user, passwd=sys_pwd)
                if len(result) != 0:
                    error_count += 1
                    err_des = rollback_value[2] + " sgid rollback failed"
                    des_list.append(err_des)
                    logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', err_des)
                    return des_list, error_count
        logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', "Rollback Succeed.")
        del_cmd = "rm -rf /etc/" + target
        # 删除对应的备份文件
        result, output = CBBCommonUtils.cbb_run_cmd(ip, del_cmd, username=sys_user, passwd=sys_pwd)
        if not result:
            del_des = "Backup file deleted. Target is {}.".format(target)
            logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', del_des)
        else:
            error_count += 1
            del_des = "Backup file delete FAILED."
            des_list.append(del_des)
            logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', del_des)
            return des_list, error_count
    else:
        error_count += 1
        des = "Rollback FAILED, please retry."
        des_list.append(des)
        logger.debug_error(cur_user, cur_module, cur_task+'_Rollback', '', des)
        return des_list, error_count
    des_list.append("Rollback Complete.")
    logger.debug_info(cur_user, cur_module, cur_task+'_Rollback', '', "Rollback Complete.")
    return des_list, error_count


def check(ip, *args, **kwargs):
    sys_user = kwargs.get("system_user")
    sys_pwd = kwargs.get("system_pwd")
    comm = kwargs.get("command")
    try:
        des_list = []
        logger.debug_info(cur_user, cur_module, cur_task+'_Check', '', "centos_access_control_014 Start")
        if comm == 1:
            des_scan, error_scan = scan(ip, sys_user, sys_pwd, flag=0)
            des_list.extend(des_scan)
            step_error = int(error_scan)
        elif comm == 2:
            des_reinforce, error_reinforce = scan(ip, sys_user, sys_pwd, flag=1)
            des_list.extend(des_reinforce)
            step_error = int(error_reinforce)
        elif comm == 3:
            des_rollback, error_rollback = rollback(ip, sys_user, sys_pwd)
            des_list.extend(des_rollback)
            step_error = int(error_rollback)
        else:
            return {"code": 3, "count": 0, "des": ['command must be 1/2/3']}
        logger.debug_info(cur_user, cur_module, cur_task+'_Check', '', "centos_access_control_014 Complete")
        if step_error == 0:
            code = 0
        elif step_error <= -1:
            code = 2
        else:
            code = 1
        return {"code": code, "count": step_error, "des": des_list}
    except Exception as er:
        code = 1
        des = ["ERROR:", str(er)]
        logger.debug_error(cur_user, cur_module, cur_task+'_Check', '', des)
        return {"code": code, "count": 0, "des": des}


#check(ip="100.2.91.150", system_user="root", system_pwd="admin", command=0, flag=0)
